# Relationship history for MSHA mine 2900767

Current hierarchy: **Cyprus Amax Minerals Company → Cyprus Pinos Altos Corp → Pinos Altos Deming Mill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Asarco Inc → Pinos Altos Deming Mill; 1950-01-01 to 1994-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Asarco Inc → Pinos Altos Deming Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1950-01-01 to 1994-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Pinos Altos Deming Mill; 1987-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Pinos Altos Corp → Pinos Altos Deming Mill; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Pinos Altos Corp; 1994-05-01 to current/open; source msha-controller-operator-history